Improved die for forming carriage-shackles



@anni tyjiirc.

ROBERT R. MILLER, 0F PLANTSVILLE, CONNECTICUT.

Latas Patent No. 98,610, daad January 4, 1870.

The ASchedule referred to in these Lettera Patent and mnalxing part of the same.

To all whom "it may concern:

Beit known that I, ROBERT B. MILLER, of Plantsvil1e,-in the county of Hartford, and State of Connectient, have invented a newand useful Improvement in Dies for Carriage-shackles, of which the following is a full, clear, and exact description, reference being had to the accompanying drawing, forming part of this specification, and-iu whichp Figure l represents a face view of one of the primaryrdies constituting part of my invention, and

Figure 2, a transverse or vertical section of a pair of such dies in working position, and withv a partiallyformed carriage-shackle in between them.

Figure 3 represents face views of a pair of second ary dies used to form the shackle, and

Figure 4, a transverse or vertical section of a pair of said dies, as in the act of bending the shackle.

. Figure 5 is a view, in perspective, of the finished shackle.

Similar letters of reference indicate corresponding parts.

My invention consists in the use of a series of peculiarly-constructed dies for forming or shaping carriage-shackles, whereby time and labor are economized in the construction of such articles, and a better or more accurate shape secured to them, as well as a general uniformity insured in the manufacture of a series of said shackles.

In the manufacture of carriage-shackles' by or under my invention,-I use two pairs of dies, the one of which sets is primary, and the other secondary, as regards their operation to produce the shackle.

Said dies are designed to `be used in connection with a drop-press cr presses, the lower one of each pair of dies being stationary in a bed-plate, while the upper one is carried by a ram or drop, and caused to come down .upon the work in or ou the lower die, for the purpose of giving to the work its requisite form or iinish.

The shackle-blank is first formed into two straight pieces of equal lengt-h, arranged to cross each other' at right angles through` their` middle, and which may Abe doneV by splitting them from a suitable-sized bar, or making them of separate pieces and forging or welding them together where they cross each other.

Such a blank is then introduced, in a heated state, betwee'the primary-dies A A', over the grooves or formations in the lower of such dies.

These dies A A' are both formed alike, with a straight or dat groove, a a, and half or partiallyrounded cross-groove, b b, arranged to intersect each other at right angles, through their middles, and of equallength, or thereabout, with their ends of an` guiar, or it may be,curved shape, and with" indentations, c c, madein the bases of the half-rounded grooves b b, at their extremities. c

VAs arranged in the press, these dies are made to occupy reverse positions; that is, the grooves a a, of either one die, are made to face theA grooves b b,.of `the other die, which shapes the blank B, when said dies are brought together, to give the necessary rounded uisb, dd and d d', to the exterior of both pairs of arms, e cv and c e', 'of the shackle D, and a flat finish to the insidesurfaces, ff and j f', thereof, and outside end swell or finish, g g and g' g.

After the blank B has been thus preparatorily shapedin the primary Adies A' A', and the lengths or pieces composing it firmly pressed or welded together where Vthey intersect, vsaid blank, while still in a straight form, as regards its general contour, is transferred to the secondary dies E', E', which serve to give the requisite bend to the arms c c and-e' e', or cross saddle-shape to the shackle, and to otherwise press or shape it for after-dressing, puucturing, and finish- .ing by hand.`

Said dies E E are, for the most part, formed alike, with fiat indentations h h', in their middle, terminating in opposite curved and hollow lisiug surfaces ifi and 'L' i', and with cross-outlets k k and k' k', ou opposite sides-tof their middle, aud which are extended, by.

indentations l l and l l', down or up either side ofthe die, at its middle, and thc epds of the cross-outlets 1c It and lo It', terminating or being bound by shelving formations m m and on' m'.

In regard tdthese several indentations and formations, the one die E ismade somewhat larger than -its fellow, and the two dies E E areset inthe press so as to cross each other; that is, tlie one die is arranged to lie lengthwise of the width of the other, so that in bringing the two dies together, with the blankarranged so that the dat sides or surfaces of two of its arms overhang-the `side indentations 1,1, in the lower die, saidblank, at two of its ends, is turned up over or into the sides of the top die, and, at its other two and opposite ends, .turned down over and into the sides of the other die, as shown iu iig. 4.

This gives te the shackle its general iinished shape, and forms a much more perfect and sounder article,

in much less time and with less labor, than can be made under the ordinary process of forging suoli work. What is here claimed, and desired to be' secured by Letters Patent, is-

The series of dies A A and E E', constructed as described, to form carriage-shackles. R. R. MILLER.

Witnesses:

, W. E. Summen,

HENRY R. BRADLEY. 

